Which orchard language code to use for Hong-Kong

I have a page in traditionnal Chinese, I want to select the correct language code to display it, any help welcome.
I know that for mainland China and Singapore I have to use Simplified Chinese with code zh-CN, but which code to use for HK ?

Subsidiary question, anybody having experience connection from Beijin or Shangai to Microsoft Azure datacenter either in Honk-Kong, Singapore or Japan ?
Is it possible and what to expect in term of load time ?